package day07;

import java.util.Random;

public class VerificationCode {
    public static void main(String[] args) {
        String code=generateVeriCode(6);
        System.out.println(code);
    }



    public static String generateVeriCode(int len){
        String code="";
        char[] chs={'a','b','c','d','e','f','g','h','i','j','k','l',
                'm','n','o','p','q','r','s','t','u', 'v','w','x','y',
                'z','A', 'B','C','D','E','F','G','H','I','J','K','L',
                'M','N','O','P','Q', 'R','S','T','U','V','W','X','Y',
                'Z','0','1','2','3','4','5','6','7','8','9'};
        Random rand=new Random();
        for(int i=0;i<len;i++){
            int index= rand.nextInt(chs.length);
            code += chs[index];
        }
        return code;
    }
}
